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Just a thought - the usb provides a digital signal which carries information about how the signal is to be processed; mono, stereo, surround sound stereo, etc.
If the mp3 music file was only recorded in 2 speaker stereo perhaps that is how it plays back.

Admittedly the radio signal is stereo and yet it plays on four speakers but unless it is a DAB radio it is analogue and maybe that makes a difference.

Perhaps there is an internal electronic fault with the digital processing part of the unit. I suggest reading the handbook again and then perhaps contacting the seller.

Well, I don't know what exactly you had hooked up but, the yellow wire from the Pioneer connects to the vehicle battery wire(light green) behind the radio, the red wire goes to the vehicle's accessory wire(yellow/black).There doesn't seem to a ground wire listed for this vehicle behind the radio so, you have to ground the radio to chassis (some metal behind the radio).This should handle your power issue.

after you play a cd while the cd is playing go into your audio settings and adjust theres settings foe each part on a stereo if u set the audio for AM//FM then play a cd the stereo changes to the cd settings

Are you playing your ipod through the stereo with a cable in aux mode? If so check your fader and balance settings when in aux.there would be no other reason except for speaker wiring check and make sure there is no auxiliary wiring that may not be hooked up.if it's not settings, then it's wiring, unless your stereo has an internal problem in the auxiliary circuit.

the amp requires a 12 volt power constant, and a 12 volt "on" signal. you prolly have the 12 v "on" hooked up to the car stereo's antennae remote, meaning your amp gets power when the radio is on, cuase the radio is sending a signal to the amp (thinking that it is sending a signal to the antennae to raise)

You need to measure across the speakers themselves n ot the crossover (cap). If these are 8 ohm speakers, an ohm meter will read about 6 or so. That is because both impedence and resistance use the same measurement. With an ohm meter you are measuring resistance. The speakers are rated using impedence.

If both speakers are open (measure infinity), I would suspect a problem with the stereo that caused them to go open. With the stereo on and playing something (radio,cd , or whatever) use a DC voltmeter to measure between the speaker terminals (Red/Black). You should read essentially 0 no matter what the volume. If you read any DC more than 3/4 V, the problem is with the amp section of the stereo.

You may have Power antenna and amp remote turn on wires switched. Your system may be looking for turn on signal from radio and only gets it when am or fm is on because power antenna wire is hooked up instead of amp turn on signal.